My generated file that should be silent instead has tone

I would like to generate files of silence of specific durations, all at
16+kHz, 16bit wide, and single channel. After reading http://sox.
sourceforge.net/sox.html I believe the following command should do that,
but instead it produces a tone:

sox --null --rate 16k --bits 16 --channels 1
"C:/Users/me/Desktop/silent19secs.wav"
synth trim 0.0 19.907625

Please tell me how to adjust this command.

Cheers,
David

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